"It's so complicated that no one really knows what to do, " says Prof Jankovic.
Jankovic won with steady play from the baseline, while the big-swinging Muguruza committed 29 unforced errors.
In March, Jankovic beat Caroline Wozniacki to win the BNP Paribas Open at Indian Wells.
Jankovic squandered three match points in the third set as Dementieva forced the tie-breaker.
Meanwhile, Jankovic won an epic semifinal against fourth-seeded Russian Elena Dementieva on Saturday night.
Murray, who won the 2007 title with Jelena Jankovic, said he and Huber deserved to win.
"From what I have seen, she can play if you let her play, " Jankovic said.
Meanwhile, Marion Bartoli needed only eight games to beat Jelena Jankovic, who retired feeling unwell.
Both Bartoli and Jankovic were already out of contention to reach the last four.
Jankovic admitted she had made too many unforced errors after a good start to the match.
Jankovic, the 2007 champion, defeated Stefanie Voegele, 6-4, 6-7 (6), 6-2 in the other semifinal.
Fourth seed Nicole Vaidisova fought back to beat sixth seed Jelena Jankovic 5-7 7-6 (7-5) 6-4.
Jankovic will face qualifier Vera Dushevina , who beat Anastasia Rodionova 6-2 7-6 (9-7).
BBC: Ana Ivanovic beats Victoria Azarenka at Cincinnati Open
"I took some painkillers to be able to play, otherwise it's quite sore, " Jankovic said.
The top-ranked woman will play for her second straight title in this tournament Sunday against Jelena Jankovic.
Fifth seed Li Na, who won at Roland Garros in 2011, suffered a shock defeat against Jelena Jankovic.
Jankovic's protestations fell on deaf ears and drew whistles from the crowd at the half-full stadium in Rome.
Serbia's Jelena Jankovic won through to round three after a 6-3 3-6 6-1 win over American Bethanie Mattek-Sands.
It has been nearly four years since Jelena Jankovic reached No. 1, and she's won just six titles.
WSJ: Victoria Azarenka: One Is a Lonely Number in Women's Tennis
Veteran 19th seed Amanda Coetzer also needed three sets to see off Yugoslavia's Jelena Jankovic 6-2 4-6 6-4.
Sixth seed Jelena Jankovic also progressed after coming from behind to beat France's Aravane Razai 4-6 6-4 7-5.
Second seed Zvonareva cruised past Jelena Jankovic 6-3 6-0 in the opening round-robin match in the White Group.
Jankovic meanwhile, will be seeking to halt her career spiral after bowing out of the clay season opener.
With the midday temperature in the mid-50s, Jankovic took the court wearing pink leggings and a long-sleeve pink shirt.
When former No.1-ranked Serbian tennis player Jelena Jankovic was dropped by Reebok she turned to Chinese sportswear firm Anta.
Jankovic will take over the world number one ranking from fellow Serb Ana Ivanovic if she wins the title.
Jankovic, who unlike her compatriot Ivanovic has never won a Grand Slam tournament, is also enjoying a career resurgence.
CNN: Ivanovic rises from the ashes in Rome as Venus crashes out
The group who met the Queen also included Venus Williams, Caroline Wozniacki, Jelena Jankovic, Novak Djokovic and Andy Roddick.
Meanwhile, top seed Jelena Jankovic had a 7-5 6-2 victory over Vania King.
Second-seeded Jelena Jankovic and sixth seed Ana Ivanovic set up an all-Serb clash.
应用推荐